图7. 当$U_{\rm r} = 11.0$和$\theta = 60^ \circ$时,不同时刻下圆柱周围涡量场(左)和压强场(右)
Fig.7. Vorticity fields (left) and pressure fields (right) around the circular cylinder at$U_{\rm r} = 11.0$ and$\theta = 60^ \circ$